.result > div{
  display: inline-block;
  width: 160px;
  height: 160px;
  line-height: 160px;
  text-align: center;
  font-weight: bold;
  font-size: 1.2em;
  color: white;
  background-color: gray;
  cursor: pointer;
}
.result > div.red{
  background-color: tomato;
  opacity: 1;
}
.result > div.green{
  background-color: olivedrab;
  visibility: visible;
}
.result > div.blue{
  background-color: dodgerblue;
  display: none;
}